From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:36144) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1YNMtv-0005Rn-Ap for qemu-devel@nongnu.org; Mon, 16 Feb 2015 09:43:56 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1YNMts-0003tX-L7 for qemu-devel@nongnu.org; Mon, 16 Feb 2015 09:43:55 -0500 Received: from mail-ph.de-nserver.de ([85.158.179.214]:57451) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1YNMts-0003tE-Bw for qemu-devel@nongnu.org; Mon, 16 Feb 2015 09:43:52 -0500 Message-ID: <54E20226.8090103@profihost.ag> Date: Mon, 16 Feb 2015 15:43:50 +0100 From: Stefan Priebe - Profihost AG MIME-Version: 1.0 References: <54E0E974.4010301@profihost.ag> <54E1E188.4050407@redhat.com> In-Reply-To: <54E1E188.4050407@redhat.com> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Subject: Re: [Qemu-devel] slow speed for virtio-scsi since qemu 2.2 List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Paolo Bonzini , qemu-devel Hi, Am 16.02.2015 um 13:24 schrieb Paolo Bonzini: > > > On 15/02/2015 19:46, Stefan Priebe wrote: >> >> while i get a constant random 4k i/o write speed of 20.000 iops with >> qemu 2.1.0 or 2.1.3. I get jumping speeds with qemu 2.2 (jumping between >> 500 iops and 15.000 iop/s). >> >> If i use virtio instead of virtio-scsi speed is the same between 2.2 and >> 2.1. > > http://wiki.qemu.org/Contribute/ReportABug > > What is your command line? > > Paolo > Could it be that this is a results of compiling qemu with --enable-debug to get debugging symbols? Stefan